Stadium: Court 3 Round: 25 Ground: Hardcourt outdoor
| Challenger Columbus | 2021/09/19 17:35 | Evan King v Donald Young | 7-5,4-6,6-4 |
| Challenger Cary | 2021/09/13 23:25 | Donald Young v Denis Kudla | 6-7,6-4,2-6 |
| ATP Winston-Salem | 2021/08/21 19:45 | Donald Young v Tung-Lin Wu | 0-6,0-6 |
| ATP Atlanta | 2021/07/24 15:50 | Peter Gojowczyk v Donald Young | 6-4,6-1 |
| Challenger Cary | 2021/07/19 23:00 | Stefan Kozlov v Donald Young | 4-6,6-4,6-4 |
| UTR Pro Tennis Series Atlanta | 2021/07/07 16:30 | Mac Kiger v Donald Young | 7-6,2-6,0-5 |
| UTR Pro Tennis Series Atlanta | 2021/07/06 13:30 | Andrew Rogers v Donald Young | 1-6,6-4,7-6 |
| UTR Pro Tennis Series Atlanta | 2021/07/04 15:00 | Donald Young v Juan Pablo Cenoz | 2-6,6-4,5-1 |
| Challenger Istanbul | 2021/09/14 07:00 | Tatsuma Ito v Tung-Lin Wu | 3-6,2-6 |
| Challenger Cassis | 2021/09/08 13:30 | Tatsuma Ito v Kacper Zuk | 5-7,3-6 |
| Challenger Cassis | 2021/09/06 12:00 | Arthur Fils v Tatsuma Ito | 6-7,7-5,1-6 |
| Challenger Mallorca | 2021/09/01 14:00 | Michael Geerts v Tatsuma Ito | 4-6,6-2,6-1 |
| US Open | 2021/08/25 19:45 | Tatsuma Ito v Liam Broady | 4-6,1-6 |
| ATP Washington | 2021/07/31 19:05 | Tatsuma Ito v Sebastian Ofner | 6-7,2-6 |
| Challenger Lexington | 2021/07/26 22:30 | Tatsuma Ito v Maxime Cressy | 6-4,3-6,4-6 |
| Challenger Cary | 2021/07/20 15:00 | Sam Riffice v Tatsuma Ito | 6-7,6-4,7-5 |